Some dirty little spammer appears to have used valid mjtnet.com email addresses for the reply-to address of a recent spamming campaign. We’re getting dozens of mail failures for emails we didn’t send out, many of which are advertising a certain men’s pharmaceutical product. Nothing to do with us.
What can be done? Not a lot. We already have SPF records set up for our domain. SPF defines which mail servers are allowed to send mail for a specific domain. Unfortunately the vast majority of mail servers don’t bother to do SPF checks. Any that do will be rejecting those spam messages as they were sent from a different mail server to the one our domain permits to be used. But most won’t.
So I guess all we can do is wait for this to die down, filter out the mail failures and hope that this recent hijacking doesn’t get us unfairly blacklisted!
